Theorem rnun 5075

Description: Distributive law for range over union. Theorem 8 of [Suppes] p. 60. (Contributed by NM, 24-Mar-1998.)

Assertion

Ref	Expression
rnun	|- ran ( A u. B ) = ( ran A u. ran B )

Proof of Theorem rnun

Step	Hyp	Ref	Expression
1		cnvun 5072	. . . 4 |- `' ( A u. B ) = ( `' A u. `' B )
2	1	dmeqi 4864	. . 3 |- dom `' ( A u. B ) = dom ( `' A u. `' B )
3		dmun 4870	. . 3 |- dom ( `' A u. `' B ) = ( dom `' A u. dom `' B )
4	2, 3	eqtri 2214	. 2 |- dom `' ( A u. B ) = ( dom `' A u. dom `' B )
5		df-rn 4671	. 2 |- ran ( A u. B ) = dom `' ( A u. B )
6		df-rn 4671	. . 3 |- ran A = dom `' A
7		df-rn 4671	. . 3 |- ran B = dom `' B
8	6, 7	uneq12i 3312	. 2 |- ( ran A u. ran B ) = ( dom `' A u. dom `' B )
9	4, 5, 8	3eqtr4i 2224	1 |- ran ( A u. B ) = ( ran A u. ran B )

Syntax hints:   = wceq 1364   u. cun 3152   `'ccnv 4659   dom cdm 4660   ran crn 4661

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2175

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-v 2762  df-un 3158  df-in 3160  df-ss 3167  df-sn 3625  df-pr 3626  df-op 3628  df-br 4031  df-opab 4092  df-cnv 4668  df-dm 4670  df-rn 4671

This theorem is referenced by:  imaundi  5079  imaundir  5080  rnpropg  5146  fun  5427  foun  5520  fpr  5741  fprg  5742  sbthlemi6  7023  exmidfodomrlemim  7263